US4879944A - Hydraulic control valve - Google Patents

Hydraulic control valve Download PDF

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Publication number
US4879944A
US4879944A US07/181,690 US18169088A US4879944A US 4879944 A US4879944 A US 4879944A US 18169088 A US18169088 A US 18169088A US 4879944 A US4879944 A US 4879944A
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US
United States
Prior art keywords
valve
main piston
fluid flow
outlet
control member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/181,690
Other languages
English (en)
Inventor
Maurice Tardy
Louis Marcon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bennes Marrel SA
Original Assignee
Bennes Marrel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bennes Marrel SA filed Critical Bennes Marrel SA
Assigned to BENNES MARREL, A JOINT-STOCK CO. OF THE REP. OF FRANCE reassignment BENNES MARREL, A JOINT-STOCK CO. OF THE REP. OF FRANCE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MARCON, LOUIS, TARDY, MAURICE
Application granted granted Critical
Publication of US4879944A publication Critical patent/US4879944A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/16—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/8667—Reciprocating valve
    • Y10T137/86694—Piston valve
    • Y10T137/86702—With internal flow passage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87177—With bypass

Definitions

  • the present invention concerns a hydraulic control valve that can be used in a hydraulic circuit to perform two functions using a single hydraulic pump. It is more particularly, although not exclusively, concerned with a valve designed to be fitted to the hydraulic circuit of an automobile vehicle to enable simultaneous or independent supply of a hydraulic steering system and a system for braking the wheels of the vehicle.
  • the object of the invention is to avoid these disadvantages by providing a valve for controlling one of the two functions (braking, for example) of a two-function circuit supplied by a single hydraulic pump.
  • the device in accordance with the invention is naturally designed to be 100% safe, guaranteeing independent functioning of the two circuits.
  • the present invention consists in a hydraulic valve adapted to be connected between a pressurized supply line and first and second lines feeding respective first and second circuits with different functions, said valve comprising:
  • a first control member adapted to connect said supply line to said first feed line
  • a second control member adapted to apply to said second feed line a pressure proportional to the force exerted by the user damped by virtue of a dashpot effect.
  • FIG. 1 is a hydraulic circuit diagram showing the principle of the connection provided by a control valve in accordance with the invention.
  • FIG. 2 is a longitudinal cross-section through the valve in question when it is in a neutral position, that is to say when the steering circuit is connected continuously and the braking circuit is not operated.
  • FIG. 3 is an analogous cross-section when the user operates the braking circuit, the steering circuit continuing to be supplied as usual.
  • the equipment shown in the drawings comprises a hydraulic pump 1 adapted to feed oil under pressure into an outlet line 2 from which it can be distributed to a line 3 controling the steering circuit of a vehicle and/or to a line 4 controling the braking circuit of the same vehicle.
  • the pump 2 takes up oil from a reservoir 5 and discharges it towards a point 6, at a pressure with a maximum value in the order of 140 bars, for example.
  • An adjustable pressure relief valve 7 is provided on a branch connection from the point 6: if operated because of excess pressure, the excess oil is returned to a reservoir 8. Beyond the point 6 the link 2 feeds the control valve 9 in accordance with the invention to feed the steering line 3 and/or the braking line 4.
  • the control valve 9 (see FIGS. 2 and 3) comprises three functional subsystems:
  • a steering control member 10 which connects the supply line 2 to the steering circuit 3 according to the known principle of an open center upstream circuit
  • a braking control member 12 adapted to apply to the braking circuit 4 a pressure proportional to the force exerted by the driver on the brake pedal, with a dashpot type damper.
  • control valve 9 comprises a body 13 inside a bore 44 within which a hollow cylindrical main piston 14 can slide.
  • the main piston ends with a head 15 around which slides the sleeve of a valve member 16 the rear end of which has a helical compression spring 17 bearing against it.
  • the spring has thrust applied to it by a ring 18 in abutting engagement with a flange 19 on a plunger 20 whose rear end passes out through a fixed cap 21 closing off the body 13.
  • a seal 22 ensures that the sliding of the plunger 20 in the cap 21 is fluid-tight.
  • a calibrated helical spring 23 is compressed between the flange 19 of the plunger 20 and the rear end 24 of the head 15 of the main piston 14.
  • a piston 25 slides inside the cylindrical front part of the main piston, its cross-section being calculated to balance the annular cross-section of the valve member 16 lying between:
  • the piston 25 also delimits a damper chamber 28 at the back of the blind bore within which it slides inside the main piston 14. Its foot 29 bears against a fixed screwthreaded plug 30 which closes off the body 13.
  • Lateral holes 36 and 37 formed in the hollow cylindrical wall of the main piston 14 are provided at the locations of the grooves 31 and 33, respectively, and they can be closed off in whole or in part by fluid-tight sliding within the bore of the stator body 13.
  • a circular edge 38 is provided on the outside of the main piston 14 to maintain communication between the grooves 34 and 33 to a more or less restricted degree (FIG. 3) or to isolate them from each other (FIG. 2), by virtue of fluid-tight sliding within the body 13.
  • the equipment makes it possible to perform two functions using a single pump:
  • the pressure feed to the brakes is obtained at 4 by means of a calibratable pressure reduction member 12.
  • the upstream circuit 2 which feeds the steering function being of the open center kind, the feed to the pressure reducer 12 is obtained by means of a calibratable valve type system (FIG. 1).
  • FIG. 2 shows the valve 9 in the unoperated position.
  • the groove 33 of the brake circuit is connected to the brake return groove 32 through the intermediary of the lateral holes 36 and 37 in the main piston 14.
  • the valve member 16 bears against the cap 21. There is thus a free passage between the pressure inlet groove 34 and the groove 35 connected to the steering function 3, whereas the passage between the pressure inlet groove 34 and the brake groove 33 is closed off by the main piston 14.
  • passage is provided from the pump 1 to the steering function 3, the brake function 4 being connected to the return line 32 (FIG. 1).
  • the piston 25 serves to balance the annular cross-section of the valve 16 between the diameters 26 and 27. Also, the piston 25 procures dynamic balancing of the main piston 14 by virtue of the dashpot effect.
  • FIG. 3 shows the valve in the braking position.
  • X travel of plunger 20 - dead travel 40.
  • ST annular cross-section of main piston 14 between the outside diameter of main piston and the diameter of piston 25;
  • the main piston 14 moves back and the edge 38 cuts off the passage from 34 to 33.
  • the lateral holes 36 are still not uncovered and so continue to close off the passage from 33 to 31.
  • the brake pressure is therefore proportional to the force on the plunger 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Regulating Braking Force (AREA)
  • Braking Systems And Boosters (AREA)
  • Power Steering Mechanism (AREA)
US07/181,690 1987-04-23 1988-04-14 Hydraulic control valve Expired - Fee Related US4879944A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705965A FR2614371B1 (fr) 1987-04-23 1987-04-23 Valve de commande, notamment pour les freins hydrauliques d'un vehicule
FR8705965 1987-04-23

Publications (1)

Publication Number Publication Date
US4879944A true US4879944A (en) 1989-11-14

Family

ID=9350538

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/181,690 Expired - Fee Related US4879944A (en) 1987-04-23 1988-04-14 Hydraulic control valve

Country Status (6)

Country Link
US (1) US4879944A (de)
EP (1) EP0289396B1 (de)
JP (1) JPS63279970A (de)
DE (1) DE3872298T2 (de)
ES (1) ES2034297T3 (de)
FR (1) FR2614371B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203668A (en) * 1991-06-06 1993-04-20 E. Fisher Apparatus for loading and unloading of a container structure or other loads with respect to a truck body or trailer
US20050056325A1 (en) * 2003-09-12 2005-03-17 Andrea Becocci Apparatus for connection of a caliper and a pump for hydraulic brakes
US20060151031A1 (en) * 2003-02-26 2006-07-13 Guenter Krenzer Directly controlled pressure control valve

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6038857A (en) * 1998-06-15 2000-03-21 Robert Bosch Technology Corporation Control apparatus for a brake booster
JP3397160B2 (ja) 1999-02-12 2003-04-14 トヨタ自動車株式会社 動力源と無段変速機を備えた車両の制御装置
DE102004052540A1 (de) * 2004-10-28 2006-05-11 Thyssenkrupp Presta Steertec Gmbh Lenkhilfeintegration in Zentralhydrauliksystem

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2001680A1 (de) * 1969-01-15 1970-07-30 Bendix Corp Hydraulisches Steuerventil
FR2080731A1 (de) * 1970-02-24 1971-11-19 Bendix Corp
US3662548A (en) * 1969-06-05 1972-05-16 Toyoda Machine Works Ltd Fluid control system for vehicles
US3841095A (en) * 1973-04-26 1974-10-15 Weatherhead Co Motor vehicle fluid power circuit
US4057073A (en) * 1972-05-31 1977-11-08 Cam Gears Limited Plural-service hydraulic system
US4170246A (en) * 1977-05-23 1979-10-09 Sta-Rite Industries, Inc. Pilot operator valve
FR2449009A1 (fr) * 1979-02-14 1980-09-12 Nissan Motor Perfectionnement a un surpresseur d'huile pouvant aider au freinage d'un chariot elevateur, camion, automobile et vehicule analogue
GB2065044A (en) * 1979-12-11 1981-06-24 Fiat Ricerche Motor vehicle hydraulic system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2001680A1 (de) * 1969-01-15 1970-07-30 Bendix Corp Hydraulisches Steuerventil
US3662548A (en) * 1969-06-05 1972-05-16 Toyoda Machine Works Ltd Fluid control system for vehicles
FR2080731A1 (de) * 1970-02-24 1971-11-19 Bendix Corp
US4057073A (en) * 1972-05-31 1977-11-08 Cam Gears Limited Plural-service hydraulic system
US3841095A (en) * 1973-04-26 1974-10-15 Weatherhead Co Motor vehicle fluid power circuit
US4170246A (en) * 1977-05-23 1979-10-09 Sta-Rite Industries, Inc. Pilot operator valve
FR2449009A1 (fr) * 1979-02-14 1980-09-12 Nissan Motor Perfectionnement a un surpresseur d'huile pouvant aider au freinage d'un chariot elevateur, camion, automobile et vehicule analogue
GB2065044A (en) * 1979-12-11 1981-06-24 Fiat Ricerche Motor vehicle hydraulic system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5203668A (en) * 1991-06-06 1993-04-20 E. Fisher Apparatus for loading and unloading of a container structure or other loads with respect to a truck body or trailer
US20060151031A1 (en) * 2003-02-26 2006-07-13 Guenter Krenzer Directly controlled pressure control valve
US20050056325A1 (en) * 2003-09-12 2005-03-17 Andrea Becocci Apparatus for connection of a caliper and a pump for hydraulic brakes

Also Published As

Publication number Publication date
FR2614371A1 (fr) 1988-10-28
FR2614371B1 (fr) 1993-04-09
EP0289396B1 (de) 1992-06-24
JPS63279970A (ja) 1988-11-17
DE3872298D1 (de) 1992-07-30
DE3872298T2 (de) 1992-12-03
EP0289396A1 (de) 1988-11-02
ES2034297T3 (es) 1993-04-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BENNES MARREL, ZONE INDUSTRIELLE SUD, 42161, ANDRE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:TARDY, MAURICE;MARCON, LOUIS;REEL/FRAME:004886/0211

Effective date: 19880329

Owner name: BENNES MARREL, A JOINT-STOCK CO. OF THE REP. OF FR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TARDY, MAURICE;MARCON, LOUIS;REEL/FRAME:004886/0211

Effective date: 19880329

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19891114

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362